Dipper tooth



G. W. MORK DIPPER TOOTH Feb. 15, 1938.

Filed May 20, 1956 INVENTOR- BYfl gf k fil M A TTORNEYS.

Patented Feb. 15,1938

PATENT OFFICE mrrnn. 'roorn George W. Mork, South Milwaukee, Wis., assignor to Bucyrus-Erle Company, South Milwaukee, Wis., a corporation of Delaware Application May 20,

2 Claims.

My invention relates to new and useful improvements in teeth for excavators, and more particularly for excavators of the dipper type,

although my construction could equally well be a renewable reversible wedge-shaped point, the' 10 securing being done in various ways.

It is even old to have the point provided witha rearwardly projecting tang, which fits into a slot in the base, and is secured therein by means of a wedge driven transversely through the base "and the tang. Such wedges have usually been circular in cross section, although sometimes elliptical, but either of these two shapes are found to perform merely the function of securing the point against longitudinal motion, without appreciably securing the tang against wobbling.

Accordingly it is the principal object of my invention to provide such a construction of base point and tang, and each of them, that the wedge will perform the dual function of securing the point to the base against longitudinal motion, and at the same time will secure the tang against lateral wobbling in the slot which receives it. This is very important, in order to 30 prevent wear on the base by the point, which is apt to be made of harder material.

In addition to. my principal object, above stated, I have worked out a number of novel and useful details, which will be readily evident as the'description progresses.

My invention consists in the novel parts, and in the combinations and arrangements thereof, and in the specific construction of each of the three individual elements of my invention, each being taken as a distinct and separate entity. These novel features are defined in the appended claims, and one embodiment thereof is exemplifled in the accompanying drawing, which is hereinafter described and explained.

Throughout the description, the same reference number is applied to the same member or to similar members.

Figure 1 is a side elevation, partly in section, of my tooth base, taken along the lines l-i of Figure 2.

Figure 2 is a plan view of this same base taken along the lines 2-2 of Figure 1.

Figure 3 is a plan view, corresponding to the viewpoint of Figure'2, of my copending tooth point.

1936, Serial No. 80,689

Figure 4' is a side elevation of my said point.

Figure 5 is an end view. of the large end of my wedge taken along the lines 5-5 of Fig ure 6. a

Figure 6 is a side view of this wedge.

Figure 7 is an end view of the small end of this wedge taken along the lines l-! of Figure 6.

Figure 8 is a plan view assembly of the ele ments shown separately in Figures 2, 3 and 6. 10

Referring to the drawing, it will be seen that the tooth base of Figures 1 and 2 is bifurcated into two rearwardiy projecting portions ii and i2, to embrace the edge of the dipper lip ill. The

lip extends into space I3 and may be secured to the tooth base by rivets (not shown) inserted through holes M. The method of attaching the base to the dipper lip forms no part of my invention.

If desired, the base may be provided with stiffening ribs l5.

The base isprovided with two forwardly projecting supporting portions l6, between which lies a slot i'l, partly open and partly extending into the body of the base.

Turning now to Figures 3 and 4 we see that my tooth point I8 is wedge shaped, and has two sockets, or supported portions, 19, adapted to engage the supporting portions l6 of the base.

Between these two sockets lies a rearwardly projecting tang 20.

.Now comparing the construction 01 the base shown in Figures 1 and 2 with that of the point shown in Figures 3 and 4, it will be seen that the base has a hole 2| and that the point has 5 a somewhat corresponding hole 22. The outstanding feature of these holes is as follows. The hole 2| in the base has two inclined faces 23 on its forward side, these two faces being disposed at substantially right angles to each other. The hole 22 of the tang of the point has two inclined faces 24 on its rearward side, these two faces being disposed at substantially right angles to each other. I

These faces 23 and 24 are so disposed with re- 5 lation to each other that when my wedge, which will now be described, is driven through holes 2| and 22, faces 25 of the wedge engage faces 23 of the hole in the base, and'faces 2B of the wedge engagefaces 24 of the hole in the tang of the point, thus not only clamping supported portions IQ of the point securely against supporting portions I6 01' the base, but also clamping the tang 20 of the point against lateral wobbling in the slot ll of the base.

When my wedge has been firmly driven into holes I and 22, as above described, its bendable small nd 21 is hammered over to fit into socket 28 on the base, thus securing the wedge in position.

When, in the claims, I use the word "transversely" in referring to the direction in which the slots are cut through base and tang for the insertion of the wedge, I mean substantially parallel to the digging edge of the tooth, as contrasted with being substantially perpendicular to that edge.

Having now described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement of parts hereinbefore described, except in so far as such limitations are specified in the appended claims.

I claim:

1. In a tooth for excavators, the combination of: a tip, having a digging edge, a supported portion, and a rearwardly projecting tang; a base, having a. supporting portion, to engage the supported portion of the tip, and a slot for the tang of the tip; and a wedge; there being aligned longitudinally disposed slots transversely cut through the base and the tang, each such slot through the base having at its forward end a pair of flat forward bearing faces rearwardly inclined at substantially the'same angle to the direction of application of the tang, and each such slot through the tang having at its rearward end a pair of flat rearward bearing faces forwardly inclined at substantially the same angle to the direction of application of the tang; the wedge having two pairs of faces, to engage these respective pairs of bearing faces.

2. In a tip for an excavator tooth, the combination of a digging edge; a supported portion, adapted to engage the supporting portion of a tooth base; and a rearwardly projecting tang, adapted to engage a slot on the tooth base, and having itself a transversely cut longitudinally disposed slot, which slot has at its rearward end a pair of fiat rearward bearing faces forwardly inclined at substantially the same angle to the direction of application of the tang and adapted to engage corresponding faces on a locking wedge. V

GEORGE W. MORK. 

